Rectifying installation



Oct. 27, 1931. v J. G. w. MULDER ET AL 0 RECTIFYING INSTALLATION FiledNov. 18, 1927 Patented Oct. 27, 1931 UNITED STATES JOHANNES GIJ'SBERTUSWILHELM MULDER AND EKKO OOSTERHUIS, 0F EINDHOVEN,

NETHERLANDS, ASSIGNORS TO N. V. PHILIPS GLOEILAMPENFABR-IEKEN, OF

EINDHOVEN, NETHERLANDS, A LIMITED LIABILITY COMPANY OF THE NETHER- LANDSRECTIFYING INSTALLATION Application filed November 18, 1927, Serial No.234,274, and in. Belgium January 29, 1927.

This invention refers to an alternating current rectifying installationadapted for full-wave rectification. According to the invention such arectifier has in addition to 5 output terminals for full-wave supply atleast one separate output terminal for halfwave supply. The outputvoltage in the latter case is higher than in the case of full-wavesupply.

The rectifier of the kind referred to may comprise a supply transformerhaving two series connected secondary windings, the free ends of whichare each connected to an anode of a rectifier. According to theinvention such a rectifier may be provided by at least two outputterminals of the same polarity, one of said output terminals beingconnected to the intermediate connection of the secondary windings andthe other to one of the said connections leading to the anodes. In orderto simplify the change of connections the said terminals of the samepolarity may be connected to a common plug socket.

The invention will be more clearly understood by reference to theaccompanying drawings, in which:

Fig. 1 shows, by way of example, a circuit diagram of an installationaccording to the invention, and

Fig. 2 is a plug socket which contains the two negative leads.

Referring to Fig. 1, the reference numeral 1 designates the primary of atransformer adapted to be connected to an alternating current supply. 2and 3 are the secondary coils of the said transformer and 4. is the coilwhich supplies the heating current to the cathode 10 of the valverectifier 7. The secondary coils 2 and 3 are connected to each other andto a negative direct current terminal 11 across ballast resistances 5and 6, the free ends of the said coils are connected to the anodes 8 and9 of the rectifier, the free end of the secondary 3 also being connectedto a separate negative output terminal 12 whereas the middle point ofthe coil 1 is connected to the positive direct current terminal 13. Ofcourse instead of the free end of the secondary coil 3 the free end ofthe coil 2 and therewith the anode 8 might be connected with theterminal 12. It is also possible to connect this free end with aseparated terminal (not shown in the figure). The connection of thebattery B with this terminal may be obtained by a switch or in anothermanner. In Fig. 1 this connection is obtained by providing the terminals11 and 12 with a plug socket. This plug socket is shown apart in Fig. 2.With the negative terminal of the battery is connected a plug which maybe put either in the plughole 11 or 15. If, in the example shown, thebattery B is to be charged by the use of both half waves of thealternating current, the plug is put into the hole 14.- and the currentwill fiow for alternate half waves as follows :starting from thepositive terminal 13, through the battery B to be charged, acrossterminal 11, through ballast resistance 5, through coil 2, to anode 8,thence to cathode 10 and finally I to the point of issue, i. e. thepositive terminal 13. During the other half-waves the charging currentflows as follows Positive terminal 123, battery B, negative terminal 11,ballast resistance 6, coil 3, anode 9, cathode 10 to the positiveterminal 13. If a higher charging voltage than is obtainable with fullwave rectification is desired, only one half-cycle of the alternatingsupply current will be used and half-wave rectification will beemployed. For this purpose the negative pole of the battery is connectedto terminal 12, the charging current flowing as follows: starting frompositive terminal 13, through battery B, negative terminal 12, throughcoil 3 and variable resistances 6 and 5, through coil 2, to anode 8,cathode 10 and back to the positive terminal 13. The plug socket may beprovided with signs to prevent choosing the erroneous connection for thedetermined charge-conditions.

WVhat we claim is p 1. An alternating current rectifying installation,adapted for full wave rectification, comprising a supply transformerhaving primary and secondary windings, the secondary winding being splitinto two sections and having an intermediate connection, a directcurrent load, having positive and negative terminals, a rectifier valve,having at least two anodes and a cathode each anode being connected to aseparate free end of the said secondary Winding, and the cathode beingconnected to the positive terminal for the said load, the negativeterminal of the said load being connected to the said intermediateconnection, and a second negative terminal for the said load adapted forconnection to a free end of one of the said secondary transformerwindings sections.

2. [in alternating current rectifying installation adapted for full waverectification, comprising a supply transformer having primary andsecondary windings, the secondary windino' bein split into two parts andhaving an intermediate connection, a direct current load having apositive and a negative terminal, a rectifier valve, having at least twoles and a cathode, each anode of the said connected to a separate freehe said secondary Winding, and the being connected to the positiveterend or t cathode road being connected to the said e connection of thesaid secondary i-iding, a second negative terminal for the said leadadapted for connection to a free end of one of the secondary transformerwindings and a plug socket common to the said ne ative terminals forconnection of the direct Lull'GIll; load to the rectifying installation.

in alternating current rectifying installatie comprising a full-wavethermionic rectifying device, a source of alternating current supplytherefor, leads extending from oppc sides of the source to therespective anodes, a connection from the cathode to the load and meanson the other side of the load to selectively connect it to one point onthe source for full-Wave rectification and on another point forhalf-Wave rectification at higher voltage than at full-Waverectification.

in testimony whereof We afiir; our signaat the city of Eindhoven, this29th day ct oer, 1927.

OE-lANliES GEJSBERTUS WILHELM MULDER.

' UUSTERHUIS.

